Steve Becker Appointed President TC PipeLines GP, Inc.

Published: August 19, 2010

HOUSTON, Texas - August 17, 2010 - The Board of Directors of TC PipeLines GP, Inc.,general partner of TC PipeLines, LP (NASDAQ: TCLP) today announced the appointment ofSteve Becker to the position of President of TC PipeLines GP, Inc. (the General Partner).Becker succeeds Mark Zimmerman who will transition into the new role of Vice President,Corporate Development and Strategy with TransCanada Corporation, the Partnership'ssponsor."On behalf of all Board members it's been a pleasure to work with Mark over the years," saysGreg Lohnes, Chairman of the Board of Directors. "He was instrumental in growing thebusiness and creating enduring value for unitholders through initiatives such as the acquisitionof North Baja and the restructuring of the sponsor's incentive distribution rights. We wish him allthe best in his new role with TransCanada. Going forward, we are very confident in our choiceof Steve Becker as Mark's successor and look forward to the future of TC PipeLines, LP underhis leadership."Becker has served as a director of the General Partner since January 2007 and has mostrecently held the position of Vice President, Pipeline Development for TransCanadaCorporation. He has over 30 years of experience, and since joining TransCanada in 1990, hasheld positions in finance, natural gas marketing, strategy and business development. Beckerholds a Bachelor of Commerce degree (with distinction) from the University of Calgary and aMaster of Business Administration from the University of Western Ontario.

TC PipeLines, LP has interests in approximately 3,700 miles of federally regulated U.S.interstate natural gas pipelines, including Great Lakes Gas Transmission Limited Partnership(46.45 per cent ownership), Northern Border Pipeline Company (50 per cent ownership), NorthBaja Pipeline, LLC (100 per cent ownership) and Tuscarora Gas Transmission Company (100per cent ownership). Great Lakes is a 2,115-mile natural gas pipeline system serving markets inMinnesota, Wisconsin, Michigan and eastern Canada. The 1,249-mile Northern Border Pipelinetransports natural gas from the Montana-Saskatchewan border to markets in the midwesternUnited States. North Baja is an 80-mile bi-directional pipeline system that transports natural gasbetween southwestern Arizona and a point on the California/Mexico border where it connectswith a natural gas pipeline system in Mexico. Tuscarora is a 240-mile pipeline system thattransports natural gas from Oregon, where it interconnects TransCanada Corporation's Gas Transmission Northwest System, to markets in Oregon, California, and Nevada. TC PipeLines,LP is managed by its general partner, TC PipeLines GP, Inc., an indirect wholly-ownedsubsidiary of TransCanada Corporation. TC PipeLines GP, Inc. also holds common units of TCPipeLines, LP. Common units of TC PipeLines, LP are quoted on the NASDAQ Global SelectMarket and trade under the symbol "TCLP." For more information about TC PipeLines, LP, visitthe Partnership's website at www.tcpipelineslp.com.
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